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최병익(B. I. Choi),이학주(H. J. Lee),한승우(S. W. Han),김정엽(J. Y. Kim),황기현(K. H. Hwang),강재윤(J. Y. Kang),김윤식(Y. S. Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
A general purpose fatigue analysis software to predict fatigue lives of mechanical components and structures was developed. This software has some characteristic features including functions of searching weak regions on the free surface of finite element models in order to reduce computing time significantly, a database of fatigue properties for various materials, and an expert system which can assist any users to get more proper results. This software can be used in the environment consists of commercial finite element packages. Using the software developed fatigue analyses for a SAE keyhole specimen and an automobile knuckle were carried out. It was observed that the results were agree well with those from commercial finite element packages.
다축 랜덤하중 하에서 자동차 서브프레임의 고 되풀이수 피로손상 평가
강재윤(J.Y Kang),최병익(B.I. Choi),이학주(H.J. Lee),김기주(K.J. Kim),김주성(J.S. Kim),박봉철(B.C. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
A FEM-based analytical approach was used to evaluate the multiaxial high cycle fatigue damage of an automotive sub-frame. Elastic Multi Body Simulation (MBS) has been applied in order to determine the multiaxial load histories. The stresses due to these loads have been given by FE computation. These results have been used as the input for the multi axial fatigue analysis. For the assessment of multiaxial high cycle fatigue damage, the signed von Mises, the signed Tresca, the absolute maximum principal stress and a critical plane method have been employed. In addition, the biaxiality ratio, a<SUB>e</SUB>, the absolute maximum principal stress, σ₁ and the angle, Φ<SUB>p</SUB>, between σ₁ and the local x-axis, have been calculated to evaluate the stress state at each node.
이학주(H. J. Lee),최병익(B. I. Choi),김완두(W. D. Kim),오충석(C. S. Oh),한승우(S. W. Han),허신(S. Hur),김재현(J. H. Kim),고순규(S. G. Ko),안현균(H. G. Ahn) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
There are many applications of nanostructures, have been suggested by lots of researchers. It is<br/> highly required to measure the properties of nano-sized materials for design and fabrication of the<br/> nanostructures. In this paper, several techniques for measuring the mechanical properties of<br/> nano-structures are presented laying emphasis on the activity of Nano Property Measurement Team in<br/> KIMM. Some advanced applications of nano-indenter are described for measuring elastic, visco-elastic,<br/> frictional and adhesive properties as well as the standard methods of it. Micro-tensile test technique<br/> with accurate in-plane strain measurement method is also presented and its role in the property<br/> measurement of nanostructures is discussed.